油松人工林养分循环的研究 Ⅱ.油松人工林养分元素的动态特性

STUDIES ON THE NUTRIENT CYCLING OF PINUS TABULAEFORMIS PLANTATIONS ⅡDynamic properties of the nutrient elements in a Pinns tabulaeformis plantation stand

本文以华北中山地区的油松人工林分作为研究对象,在林分各组分营养元素含量静态分布研究的基础上,对林分养分元素的动态特性进行了分析讨论,结果表明:(1)在一年中林木枝、叶、磷、钾、镁的含量因季节而异,其变化规律与林木的生长节律有关;(2)针叶凋落的年动态及其养分含量的变化,在一定程度上也受林木生长节律影响;(3)林地枯落物平均年干重损失率为14％,与其它林种相比,该立地上的油松林分林地枯落物分解较慢。

Based on determinations of the nutrient elements contents and their distribution in various parts of a stand of Pinus tabulaeformis plantation in the middlezone of mountainous region in North China, it has been found that the dynamic properties of the nutrient elements showed: (1) P, K and Mg contents of the branches and needles changed in seasons of the year, and with the growth rhythm of the tree. (2) Needle fall and nutrient contents of the needles also changed with growth rhythm of the tree; (3) the average rate of loss in weight of forest floor materials was 14% in one year, and lower than that of other species as mentioned in literatures